My School blocked my AIM access!

Every other day at school, I have a 2-hour block in which I usually have nothing to do... so I end up wasting it away on websites (like this one) and on AIM.

Well, it appears that the school has blocked the port for AIM access!
does anyone know how I can get around it? I always used the HTTPS proxy in iChat, and it no long works. It just gives me a connection error. The same thing happens on all the macs I've used in the school, so I know its not messed up settings on this computer.

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